Question Detail
Question
When the magnetic field is parallel to the plane of the area, the magnetic flux through the coil is
Correct Answer
Option A is the correct answer.
Detailed Explanation
Flux Φ = BAcosθ, where θ is measured from the normal to the surface. If B lies in the plane of the coil, it is perpendicular to the normal (θ=90°), so Φ = 0.
Hint
Remember flux depends on the angle between B and the area's normal vector, not the plane itself.